.sidebar-nav {
    background-color: #444;
}
    .sidebar-nav ul {
        padding: 0;
        margin: 0;
        list-style: none;
        background-color: #444;
    }
    .sidebar-nav .metismenu {
        display: -webkit-box;
        display: -ms-flexbox;
        display: flex;
        -webkit-box-orient: vertical;
        -webkit-box-direction: normal;
        -ms-flex-direction: column;
        flex-direction: column;
    }
        .sidebar-nav .metismenu > li {
            display: -webkit-box;
            display: -ms-flexbox;
            display: flex;
            -webkit-box-orient: vertical;
            -webkit-box-direction: normal;
            -ms-flex-direction: column;
            flex-direction: column;
            position: relative;
        }
        .sidebar-nav .metismenu a {
            position: relative;
            display: block;
            padding: 12px;
            outline-width: 0;
            transition: all .3s ease-out;
        }
@media (min-width: 992px) {
    .sidebar-nav .metismenu li {
        position: relative;
    }
    .sidebar-nav .metismenu > li > ul {
        position: absolute;
        left: 100%;
        top: 0;
        min-width: 200px;
        z-index: 1001;
    }
    .sidebar-nav .metismenu > li:hover > ul {
        height: auto !important;
    }
        .sidebar-nav .metismenu > li:hover > ul,
        .sidebar-nav .metismenu > li:hover > ul.collapse {
            display: block;
        }
    .sidebar-nav .metismenu > li:hover > a.has-arrow:after {
        transform: rotate(135deg);
    }
}